手机锁屏状态下，后台服务无法扫描蓝牙设备

搜索蓝牙接口：

/**
     * Start Bluetooth LE scan. The scan results will be delivered through {@code callback}.
     * For unfiltered scans, scanning is stopped on screen off to save power. Scanning is
     * resumed when screen is turned on again. To avoid this, do filetered scanning by
     * using proper {@link ScanFilter}.
     * <p>
     * An app must hold
     * {@link android.Manifest.permission#ACCESS_COARSE_LOCATION ACCESS_COARSE_LOCATION} or
     * {@link android.Manifest.permission#ACCESS_FINE_LOCATION ACCESS_FINE_LOCATION} permission
     * in order to get results.
     *
     * @param filters {@link ScanFilter}s for finding exact BLE devices.
     * @param settings Settings for the scan.
     * @param callback Callback used to deliver scan results.
     * @throws IllegalArgumentException If {@code settings} or {@code callback} is null.
     */
    @RequiresPermission(Manifest.permission.BLUETOOTH_ADMIN)
    public void startScan(List<ScanFilter> filters, ScanSettings settings,
            final ScanCallback callback) {
        startScan(filters, settings, null, callback, /*callbackIntent=*/ null, null);
    }

注释上写的非常清楚：

For unfiltered scans, scanning is stopped on screen off to save power. Scanning is
* resumed when screen is turned on again. To avoid this, do filetered scanning by
* using proper {@link ScanFilter}.

没有添加过滤的情况下锁屏状态会停止扫描，所以我们只需要加上过滤条件ScanFilter即可，示例代码如下：

List<ScanFilter> scanFilters = new ArrayList<>();
            scanFilters.add(
                        new ScanFilter.Builder().setDeviceName("INPUT_YOUR_FILTER_NAME").build()
                );

          
            ScanSettings.Builder scanSettingsBuilder = new ScanSettings.Builder()
                    .setScanMode(ScanSettings.SCAN_MODE_LOW_LATENCY);
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                scanSettingsBuilder.setPhy(scannerParams.getPhy())
                        .setLegacy(false);
            }
            ScanSettings scanSettings = scanSettingsBuilder.build();

            try {
                // Cannot start unfiltered scan in location-off. This scan will be resumed when location is on: 6
                mBluetoothLeScanner.startScan(scanFilters, scanSettings, mScanCallback);
                return true;
            } catch (Exception e) {
                ZLogger.e(e.toString());
                return false;
            }

GattService.java

// Check if a scan record matches a specific filters.
    private boolean matchesFilters(ScanClient client, ScanResult scanResult) {
        if (client.filters == null || client.filters.isEmpty()) {
            return true;
        }
        for (ScanFilter filter : client.filters) {
            if (filter.matches(scanResult)) {
                return true;
            }
        }
        return false;
    }

ScanFilter.java

// Manufacturer data match.
        if (mManufacturerId >= 0) {
            if (!matchesPartialData(mManufacturerData, mManufacturerDataMask,
                    scanRecord.getManufacturerSpecificData(mManufacturerId))) {
                return false;
            }
        }